#include "stm32f4xx.h"

#define USE_HAL_DRIVER
#define HSE_VALUE 8000000
 * LEDs
 * RED PB8
 * BLUE PC13
 */

RCC_Configuration()
{
    /*
     * Enables clock for GPIO A, B & C
     */
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOCEN;
}

GPIO_Configuration(uint32_t Port,uint32_t Pin, uint32_t Mode)
{
    /*
     * Configures the GPIO port & pin to the desired Mode
     */
    GPIO_InitTypeDef GPIO_init;

    GPIO_init.Pin = Pin;
    GPIO_init.Mode = Mode;
    GPIO_init.Speed = GPIO_SPEED_FAST;
    GPIO_init.Pull = GPIO_PULLUP;

    HAL_GPIO_Init(Port,&GPIO_init);
}

void main ()
{


// enable port
RCC_Configuration();
// init led
GPIO_Configuration(GPIOC,GPIO_PIN_13,GPIO_MODE_OUTPUT_PP);

  while (1)
    {
             // Toggle led
              HAL_GPIO_TogglePin(GPIOC,GPIO_PIN_13);
                // waste time
             for (i = 0; i < 500000; i++);
    }
}